#!/usr/bin/env python3
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# This reads dat/UnicodeData.txt and dat/SpecialCasing.txt and produces a file
# that gives all the non-trivial pairs of inputs-outputs of the ECMAScript
# Canonicalize when Unicode is false and IgnoreCase is true.

upper_map = {}
for line in open("dat/UnicodeData.txt"):
    tokens = line.split(";")
    # Drop entries without toUppercase mapping
    if tokens[12].strip() == "":
        continue
    char = int(tokens[0].strip(), 16)
    upper = int(tokens[12].strip(), 16)
    upper_map[char] = [upper]

for line in open("dat/SpecialCasing.txt"):
    # Drop comments and empty lines
    if line.startswith("#") or line.strip() == "":
        continue
    tokens = line.split(";")
    # Drop entries with conditions
    if len(tokens) > 5:
        continue
    char = int(tokens[0].strip(), 16)
    upper = [int(c, 16) for c in tokens[3].split()]
    upper_map[char] = upper

for (char, upper) in upper_map.items():
    # Only follow rules which give map to a single code unit
    if len(upper) > 1 or upper[0] >= 0x10000:
        continue
    # Do not allow non-ASCII characters to cross into ASCII.
    if char >= 128 and upper[0] < 128:
        continue
    # Drop trivial mappings
    if (char == upper[0]):
        continue
    print("%X;%X" % (char, upper[0]))
